Bicadad, here is what U. Of Florida writes about root stocks for satsumas :
Trifoliate orange (Poncirus trifolata (L.) Raf) is the most commonly used rootstock for satsuma mandarins, especially in cool climates where maximum cold tolerance develops. However, in Florida, where the winters can be relatively short and interrupted by brief periods of warm temperatures, trifoliate orange does not provide consistent protection from cold south of Gainesville.
Trifoliate orange grows well on fertile, clay to loamy type soils. It does not develop a very deep or wide-ranging root system and is poorly adapted to saline or calcareous conditions, but its resistance to foot rot, a soil-borne disease, makes it a good choice for soils with poor drainage. Trifoliate orange is susceptible to exocortis, a virus-like disease; blight, a disease whose causal agent is unknown; and the burrowing nematode, with some selections resistant to the citrus nematode. Many selections of P. trifoliata are available, including a dwarfing rootstock named Flying Dragon.
'Swingle' citrumelo is a cross between P. trifoliata and 'Duncan' grapefruit (Citrus paradisi Macf.). 'Carrizo' citrange is a cross between P. trifoliata and Washington Navel (Citrus sinensis L.). Satsumas are often propagated on 'Carrizo' and especially 'Swingle' rootstocks. This is due to the fact that budding and early tree growth are better for satsumas on 'Swingle' compared to P. trifoliata. The performance of satsuma on 'Swingle' or 'Carizzo' rootstocks compared to P. trifoliata has not been adequately compared, although they are believed to be less cold tolerant than when grafted on P. trifoliata. We have observed 'Navel' on 'Carrizo' and 'Owari', and 'Brown Select' on 'Swingle' to withstand 14°F without appreciable cold injury at the North Florida Research and Education Center in Quincy, FL, when fully cold acclimated.